Prove that mn < 0 if and only if m > 0 and n < 0 or m < 0 and n > 0

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asked Jan 12, 2016 179k views

1 Answer

Massiel · Answer 1 · 2016-01-18T22:02:27+0000

Only one number can but negative for it to be true.

If both positive then product is positive

If both negative then product is also positive

(-1)*(-1)=1

Prove that mn < 0 if and only if m > 0 and n < 0 or m < 0 and n > 0

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